At its April 2010 meeting, the WECC Board of Directors approved a proposal for a cost-benefit analysis (CBA) of the Efficient Dispatch Toolkit (EDT). The EDT consists of two tools – an Energy Imbalance Market (EIM) and an Enhanced Curtailment Calculator (ECC).
The proposed EIM would be a sub-hourly, real-time energy market providing centralized, automated, interconnection-wide generation dispatch. Participation in this market would be voluntary on a Balancing Authority or Transmission Service Provider basis, and its operation would incorporate real-time generation capabilities, transmission constraints, and pricing. The automation of the EIM would allow for a more efficient use of transmission and generation in the Western Interconnection.
The ECC is an enhanced version of the current tool (webSAS) used by many entities in the Western Interconnection use for calculating curtailments on the six Qualified Transfer Paths. WECC defines a Qualified Transfer Path as “A transfer path designated by the WECC Operating Committee as being qualified for WECC unscheduled flow mitigation.” The proposed webSAS enhancements would allow the ECC to be used to calculate curtailments for unscheduled flow on all rated paths, and potentially some currently-unrated paths. The proposed enhancements would also allow real-time updates of transmission system data to include actual outages (currently the data is updated twice annually). The ECC can be developed and implemented independently of the EIM. However, it also provides several important building blocks necessary for the implementation of the EIM.